Diamond vs Gold: Which Is the Better Investment (And Why)?

Many jewellery buyers treat the diamond in a ring the same way they treat the gold around it — as something that holds value, maybe even grows in value, the way gold does. It doesn't, and the reasons why are worth understanding before you decide how much of your budget goes into the stone versus the metal.

How Gold Behaves as an Investment

Gold has a real, standardised, globally fungible market: a live spot price quoted every second across exchanges worldwide, futures markets, ETFs, and central banks holding it as a reserve asset. One gram of 24K gold anywhere is interchangeable with any other gram of 24K gold — that fungibility is exactly what makes it possible to buy, sell, and price gold instantly and transparently, whether as jewellery, coins, bars, or a Gold ETF.

Why Diamonds Don't Work the Same Way

A diamond has no equivalent. There's no exchange-traded spot price for diamonds, and no two diamonds are interchangeable — a half-carat stone isn't equivalent to two quarter-carat stones the way half a gram of gold is equivalent to two quarter-gram portions. Every diamond is graded and priced individually on its own cut, colour, clarity, and carat, through an opaque, dealer-network-based pricing system rather than a public market. Diamond-industry sources describing this gap directly point to exactly this lack of fungibility and standardised pricing as the core structural reason diamonds don't behave like an investable commodity the way gold does.

How Diamond Scarcity Was Manufactured

Diamonds aren't actually as rare as their price suggests, and that's not an accident of geology — it's a legacy of deliberate market engineering. For most of the 20th century, De Beers (through its Diamond Trading Company / Central Selling Organisation) controlled somewhere between 80% and 90% of the world's rough diamond trade — peaking near 90% in the early 1900s and still around 80% as late as the 1980s — and used that dominance to deliberately stockpile diamonds, restricting supply to keep prices from falling, a well-documented strategy rather than a rumour.

On top of controlling supply, De Beers manufactured the demand side too. The company hired advertising agency N.W. Ayer in 1938, and in 1947 Ayer copywriter Frances Gerety wrote the line "A Diamond Is Forever," which first ran in ads in 1948. That campaign is widely credited with creating the now-universal expectation that an engagement requires a diamond — and, just as importantly, with discouraging buyers from ever reselling their diamonds, which suppressed the very secondary market that would otherwise have put diamond prices to a real, continuous market test the way gold's resale market does every day.

Today's Diamond Market: Different Problem, Same Result

De Beers' grip has genuinely loosened — by 2025 its share of global rough diamond supply had fallen to roughly 26-27%, with rival Alrosa now controlling a comparable 28-31%, nothing close to the 80-90% dominance of the cartel era. But that hasn't fixed the underlying problem for a diamond buyer — it's just changed its shape. Instead of engineered scarcity, the market is now dealing with a genuine glut.

• De Beers disclosed a rough-diamond stockpile of roughly $2 billion in 2024 — its largest since the 2008 financial crisis — alongside a $2.3 billion impairment tied to weak demand and rough-diamond oversupply.
• De Beers cut production by 23% in the first half of 2025 (to 10.2 million carats) in response to that weak demand, per the company's own 2025 interim results.
• Anglo American, which owns 85% of De Beers, has been actively trying to sell or spin off its stake as part of restructuring — reporting has linked this directly to the diamond business's weak recent performance.
• Industry coverage attributes the slump to a mix of factors: a generational shift toward lab-grown diamonds (especially among younger buyers), and weaker demand from China, historically one of the largest diamond markets.

Lab-Grown Prices Are the Clearest Evidence of the Glut

The clearest proof that diamonds are oversupplied, not scarce, is what's happened to lab-grown diamond prices. Bain & Company's diamond industry report (via Rapaport, February 2021) tracked 1-carat lab-grown prices falling from about 65% of the equivalent natural diamond's price in 2017 to roughly 35% by 2020 — and industry trade coverage since has reported the gap widening further through the mid-2020s as production capacity kept expanding faster than demand. See our companion guide, Lab-Grown vs Natural Diamonds: Full Comparison & Price Guide, for the full picture, including why lab-grown resale value has fallen even further than the wholesale price itself.

What a Diamond Is Actually Worth When You Sell It

This is the number that matters most if you're thinking of a diamond as any kind of investment. Jewellery-trade and consumer-finance sources consistently put natural diamond resale value at roughly 20-60% of the original retail price, with 25-50% cited most often — online and auction buyers tend to pay toward the higher end, local jewellers toward the lower end. There's no official index behind this figure the way there is for gold, precisely because there's no standardised market to measure it against; it's simply what buyers have reported receiving. Lab-grown diamonds fare worse still, reselling for roughly 1-10% of retail by the same sources, consistent with their falling wholesale price.

Gold vs Diamond: How ₹1,00,000 Actually Grows

Put the same ₹1,00,000 into each, and the difference isn't subtle. Gold has an ongoing, compounding market price; a diamond, once bought, has a resale value that's already a fraction of what you paid the moment you walk out of the store, and no established mechanism to grow from there the way a fungible, exchange-priced commodity does.

So Which Is the Better Investment?

Gold — clearly, on every measure that matters for an investment: a real-time global market price, deep liquidity, central-bank-grade recognition, and a resale value anchored to that live price rather than to one dealer's opinion of one stone. A diamond has none of that. Its price historically depended on a controlled supply and manufactured demand that have both weakened, and what's replaced them is a genuine supply glut that's pushed even wholesale prices down — with no equivalent of gold's spot market to put a floor under what an individual stone is actually worth.

If You Still Want the Stone

None of this means you shouldn't buy a diamond — if you love how it looks, that's a completely valid reason to buy one, the same way buying jewellery for the joy of wearing it is valid. The mistake is treating the stone budget as an investment. If part of what you're spending is meant to actually grow in value, that portion is better placed in gold — a coin, bar, Gold ETF, or Sovereign Gold Bond will preserve and compound that value far more reliably than a bigger or higher-grade stone will, precisely because gold, unlike a diamond, has a real market standing behind it every day.